{"id":"CVE-2026-39391","aliases":["EUVD-2026-20484","GHSA-7cm9-v848-cfh2"],"status":"published","title":"CI4MS has Stored XSS via Unescaped Blacklist Note in Admin User List","description":"CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00235,"percentile":0.14515,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-04-08T14:30:18Z","modified":"2026-10-28T02:31:03Z","fixes":[{"ecosystem":"Packagist","package":"ci4-cms-erp/ci4ms","fixed_in":["0.31.4.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"ci4-cms-erp/ci4ms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.31.3.0"},{"fixed":"0.31.4.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"ci4-cms-erp/ci4ms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.31.4.0"}]}],"versions":["0.21.0","0.21.1","0.21.2","0.21.3","0.21.3.1","0.21.3.2","0.21.3.3","0.21.3.4","0.21.3.5","0.21.3.6","0.21.3.7","0.23.0.0","0.23.0.1","0.23.0.2","0.23.1.0","0.24.0.0","0.24.0.16","0.24.0.18","0.24.0.19","0.24.0.20","0.24.0.27","0.24.0.42","0.24.0.45","0.24.0.60","0.25.0.0","0.25.0.1","0.25.0.2","0.25.0.30","0.25.0.39","0.25.0.43","0.25.1.0","0.25.2.0","0.25.3.0","0.26.0.0","0.26.1.0","0.26.2.0","0.26.3.0","0.26.3.1","0.26.3.2","0.26.3.3","0.26.3.4","0.27.0.0","0.28.0.0","0.28.3.0","0.28.4.0","0.28.5.0","0.28.6.0","0.31.0.0","0.31.1.0","0.31.2.0","0.31.3.0"]}],"products":[{"vendor":"ci4-cms-erp","product":"ci4ms"}],"references":[{"url":"https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2","tags":["x_refsource_CONFIRM","exploit","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39391","tags":["advisory"]},{"url":"https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.4.0","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7cm9-v848-cfh2"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39391.json","tags":["advisory"]},{"url":"https://github.com/ci4-cms-erp/ci4ms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-39391","title":"CI4MS has Stored XSS via Unescaped Blacklist Note in Admin User List","description":"CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.","status":"published","published":"2026-04-08T14:30:18.75Z","modified":"2026-04-08T15:18:08.667Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:02.662847Z"}],"euvd":[{"id":"EUVD-2026-20484","description":"CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.","status":"published","published":"2026-04-08T14:30:18Z","modified":"2026-04-08T15:18:08Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:12.037386Z"}],"ghsa":[{"id":"GHSA-7cm9-v848-cfh2","title":"CI4MS has stored XSS via Unescaped Blacklist Note in Admin User List","description":"## Summary\n\nThe blacklist (ban) note parameter in `UserController::ajax_blackList_post()` is stored in the database without sanitization and rendered into an HTML `data-note` attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page.\n\n## Details\n\nIn `modules/Users/Controllers/UserController.php`, the `ajax_blackList_post()` method (line 344-362) accepts a `note` POST parameter with only a `required` validation rule:\n\n```php\n// Line 347 — validation only checks 'required', no sanitization\n$valData = (['note' =\u003e ['label' =\u003e lang('Backend.notes'), 'rules' =\u003e 'required'],\n             'uid' =\u003e ['label' =\u003e 'uid', 'rules' =\u003e 'required|is_natural_no_zero']]);\n\n// Line 352 — raw user input passed directly to ban()\n$user-\u003eban($this-\u003erequest-\u003egetPost('note'));\n```\n\nShield's `Bannable::ban()` trait stores the message as-is:\n```php\n// vendor/codeigniter4/shield/src/Traits/Bannable.php\npublic function ban(?string $message = null): self\n{\n    $this-\u003estatus         = 'banned';\n    $this-\u003estatus_message = $message;  // No escaping\n    // ...\n}\n```\n\nIn the `users()` method (line 13-91), when building the DataTables response, the `status_message` is concatenated directly into HTML without escaping:\n\n```php\n// Line 55 — esc() IS used here (correct)\n$result-\u003efullname = esc($result-\u003efirstname) . ' ' . esc($result-\u003esurname);\n\n// Line 58-59 — NO esc() on status_message (vulnerable)\nif ($result-\u003estatus == 'banned'):\n    $result-\u003eactions .= '\u003cbutton ... data-note=\"' . $result-\u003estatus_message . '\"\u003e'\n```\n\nThe HTML string is returned as JSON (line 90) and DataTables renders it into the DOM. CSP is disabled (`$CSPEnabled = false` in `App.php`), and no `SecureHeaders` filter is applied.\n\n## PoC\n\n**Step 1 — Store XSS payload via ban endpoint:**\n```bash\ncurl -X POST 'https://TARGET/backend/users/blackList' \\\n  -H 'X-Requested-With: XMLHttpRequest' \\\n  -H 'Cookie: ci_session=ADMIN_SESSION_WITH_UPDATE_PERM' \\\n  -d 'uid=2\u0026note=%22+onmouseover%3D%22alert(document.cookie)%22+x%3D%22'\n```\n\nExpected response: `{\"result\":true,\"error\":{\"type\":\"success\",\"message\":\"...\"}}`\n\n**Step 2 — Trigger payload:**\nAny admin navigating to `/backend/users` will receive HTML containing:\n```html\n\u003cbutton ... data-note=\"\" onmouseover=\"alert(document.cookie)\" x=\"\"\u003e\n```\n\nThe XSS fires when the admin hovers over the blacklist button for the banned user.\n\n**Alternative immediate-execution payload:**\n```\nnote=\"\u003e\u003cimg src=x onerror=alert(document.cookie)\u003e\n```\n\n## Impact\n\n- **Session hijacking**: An attacker with blacklist privileges can steal session cookies of other admins (including superadmins who view the user list but are themselves protected from being banned).\n- **Privilege escalation**: A lower-privileged admin could use stolen superadmin sessions to gain full control.\n- **Persistent**: The payload persists in the database and fires every time the user list is loaded, affecting all admins who view the page.\n\n## Recommended Fix\n\nWrap `status_message` with `esc()` to match the escaping already applied to other user fields on line 55:\n\n```php\n// In users() method, line 58-59 — change:\n$result-\u003eactions .= '\u003cbutton type=\"button\" class=\"btn btn-outline-dark btn-sm open-blacklist-modal\"\n                        data-id=\"' . $result-\u003eid . '\" data-status=\"' . $result-\u003estatus . '\" data-note=\"' . esc($result-\u003estatus_message) . '\"\u003e\u003ci\n```","status":"published","published":"2026-04-08T19:15:32Z","modified":"2026-04-08T19:15:34Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:39:51.193071Z"}],"nvd":[{"id":"CVE-2026-39391","description":"CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.","status":"published","published":"2026-04-08T15:16:13.897Z","modified":"2026-07-20T20:10:00.11Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:13.535987Z"}],"osv":[{"id":"CVE-2026-39391","title":"CI4MS has Stored XSS via Unescaped Blacklist Note in Admin User List","description":"CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.","status":"published","published":"2026-04-08T14:30:18.75Z","modified":"2026-10-28T02:31:03.303311789Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"GHSA-7cm9-v848-cfh2","title":"CI4MS has stored XSS via Unescaped Blacklist Note in Admin User List","description":"## Summary\n\nThe blacklist (ban) note parameter in `UserController::ajax_blackList_post()` is stored in the database without sanitization and rendered into an HTML `data-note` attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page.\n\n## Details\n\nIn `modules/Users/Controllers/UserController.php`, the `ajax_blackList_post()` method (line 344-362) accepts a `note` POST parameter with only a `required` validation rule:\n\n```php\n// Line 347 — validation only checks 'required', no sanitization\n$valData = (['note' =\u003e ['label' =\u003e lang('Backend.notes'), 'rules' =\u003e 'required'],\n             'uid' =\u003e ['label' =\u003e 'uid', 'rules' =\u003e 'required|is_natural_no_zero']]);\n\n// Line 352 — raw user input passed directly to ban()\n$user-\u003eban($this-\u003erequest-\u003egetPost('note'));\n```\n\nShield's `Bannable::ban()` trait stores the message as-is:\n```php\n// vendor/codeigniter4/shield/src/Traits/Bannable.php\npublic function ban(?string $message = null): self\n{\n    $this-\u003estatus         = 'banned';\n    $this-\u003estatus_message = $message;  // No escaping\n    // ...\n}\n```\n\nIn the `users()` method (line 13-91), when building the DataTables response, the `status_message` is concatenated directly into HTML without escaping:\n\n```php\n// Line 55 — esc() IS used here (correct)\n$result-\u003efullname = esc($result-\u003efirstname) . ' ' . esc($result-\u003esurname);\n\n// Line 58-59 — NO esc() on status_message (vulnerable)\nif ($result-\u003estatus == 'banned'):\n    $result-\u003eactions .= '\u003cbutton ... data-note=\"' . $result-\u003estatus_message . '\"\u003e'\n```\n\nThe HTML string is returned as JSON (line 90) and DataTables renders it into the DOM. CSP is disabled (`$CSPEnabled = false` in `App.php`), and no `SecureHeaders` filter is applied.\n\n## PoC\n\n**Step 1 — Store XSS payload via ban endpoint:**\n```bash\ncurl -X POST 'https://TARGET/backend/users/blackList' \\\n  -H 'X-Requested-With: XMLHttpRequest' \\\n  -H 'Cookie: ci_session=ADMIN_SESSION_WITH_UPDATE_PERM' \\\n  -d 'uid=2\u0026note=%22+onmouseover%3D%22alert(document.cookie)%22+x%3D%22'\n```\n\nExpected response: `{\"result\":true,\"error\":{\"type\":\"success\",\"message\":\"...\"}}`\n\n**Step 2 — Trigger payload:**\nAny admin navigating to `/backend/users` will receive HTML containing:\n```html\n\u003cbutton ... data-note=\"\" onmouseover=\"alert(document.cookie)\" x=\"\"\u003e\n```\n\nThe XSS fires when the admin hovers over the blacklist button for the banned user.\n\n**Alternative immediate-execution payload:**\n```\nnote=\"\u003e\u003cimg src=x onerror=alert(document.cookie)\u003e\n```\n\n## Impact\n\n- **Session hijacking**: An attacker with blacklist privileges can steal session cookies of other admins (including superadmins who view the user list but are themselves protected from being banned).\n- **Privilege escalation**: A lower-privileged admin could use stolen superadmin sessions to gain full control.\n- **Persistent**: The payload persists in the database and fires every time the user list is loaded, affecting all admins who view the page.\n\n## Recommended Fix\n\nWrap `status_message` with `esc()` to match the escaping already applied to other user fields on line 55:\n\n```php\n// In users() method, line 58-59 — change:\n$result-\u003eactions .= '\u003cbutton type=\"button\" class=\"btn btn-outline-dark btn-sm open-blacklist-modal\"\n                        data-id=\"' . $result-\u003eid . '\" data-status=\"' . $result-\u003estatus . '\" data-note=\"' . esc($result-\u003estatus_message) . '\"\u003e\u003ci\n```","status":"published","published":"2026-04-08T19:15:32Z","modified":"2026-04-08T19:41:25.36201Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:41.002603Z"}]}}